Quick switching method for screw oil pumps

Abstract

The invention discloses a quick switching method for screw oil pumps. The quick switching method comprises the following steps: step 1, adding automatic judgment logic of a switching mode of lubricating oil pumps; step 2, normally switching interlocking logic of the screw lubricating oil pumps; and step 3, switching abnormal interlocking logic of the screw lubricating oil pumps. After the switching mode of the two screw lubricating oil pumps is changed from manual switching to logic judgment automatic switching, the parallel operation time of the two lubricating oil pumps in the switching process is greatly shortened, the fluctuation amplitude of the pressure of a lubricating oil main pipe in the switching process is reduced, and the risks of damage to equipment and influence on safe operation of a unit due to oil pump overpressure and motor overloading caused by long-time parallel operation are reduced to a great extent.

Description

technical field [0001] The invention relates to the technical field of coal chemical industry, in particular to a fast switching method of a screw oil pump. Background technique [0002] The centrifugal compressor lubricating oil system is equipped with two electric screw lubricating oil pumps, one main and one auxiliary, both of which are of the same model and serve as backups for each other. During normal operation, the main oil pump supplies lubricating oil to each lubricating point, and the other oil pump is in a standby state. The outlet pressure of the lubricating oil pump and the pressure of the oil supply main pipe are adjusted respectively through two self-operated regulating valves. The pressure of the oil supply main pipe is about 200KPa . [0003] When the main oil pump needs to be repaired or needs to be switched due to other failures, after confirming that the standby electric oil pump meets the switching conditions, start the standby lubricating oil pump manu...

AI Technical Summary

Problems solved by technology

[0005] During the switchover of the compressor oil pump, the two screw oil pumps run in parallel. It takes a certain amount of time to check and judge the parameters manually, and the parallel operation of the two screw oil pumps for a long time may cause overpressure of the oil pump and motor overload, thus damaging the equipment , affecting the safe operation of the unit

[0006] When the two screw oil pumps of the compressor need to be switched, if the switching is carried out according to the original method, the two screw oil pumps will need to run in parallel for a long time, which will cause overpressure of the oil pump and overload of the motor, which will damage the equipment and affect the safe operation of the unit. Therefore, Design a fast switching method for screw oil pumps to achieve safe and smooth switching of pumps in a short period of time (5 seconds)

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